package com.nbufe.observer.demo2;

/**
 * @Author Zan
 * @Create 2024/5/29 14:02
 * @ClassName: Subject
 * @Description : TODO 请用一句话描述该类的功能
 */
public interface Subject {

    public void addObserver(Observer o);

    public void delObserver(Observer o);

    public void notifyMsg();
}
